Motherboards for Socket 478 Intel based computers are becoming something of a rarity now to buy on the open market. Plenty of ebay sellers sell them including me. Of the ones that are for sale on ebay most are second user ( excluding mine of course, mine are new )
I am always a bit wary of buying a used motherboard for an emachine for example. The motherboards on these computers were never brilliant and their longevity of life has never been very good, all the less reason to replace your motherboard with a used one.
The trouble is there aren't too many places to but these new now, the hardware format has been in the archives for some 4 years now although it is still easy to buy new Intel socket 478 processors.
So what are the choices to revive an Intel socket 478 based pc? As the cases are built to industry standard architecture ( ISA) the choices are wide and plentiful. You could replace the motherboard,cpu,fan.memory by putting in a motherboard bundle kit comprising either an Intel socket 775 or AMD AM2 based motherboard. Both choices are easy to fit for even the most reticent diy'ers. Doing so will revive your pc and give it at least 5 years more life and what's more you will not lose any files or data. Need more help on this subject ? contact me on my ebay pages.